 75.The core of the music is by Tchaikovsky, but the realisation was by Taneyev, and the decisions on the form, genre and title were jointly made by Taneyev, Tchaikovsky's brother Modest, Alexander Siloti and the publisher Mitrofan Belyayev.It was nevertheless published in 1897 as a work of Tchaikovsky's alone, and even given the posthumous opus number 79 in Tchaikovsky's catalogue.